# __gnu_debug::Safe_iterator_base Class Reference

Basic functionality for a "safe" iterator. More...

`#include <safe_base.h>`

Inheritance diagram for __gnu_debug::Safe_iterator_base:

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Collaboration diagram for __gnu_debug::Safe_iterator_base:

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List of all members.

## Public Member Functions
void | M_attach (Safe_sequence_base *seq, bool constant)
void | M_detach ()
bool | M_attached_to (const Safe_sequence_base *seq) const
bool | M_singular () const
bool | M_can_compare (const Safe_iterator_base &x) const
## Public Attributes
Safe_sequence_base * | M_sequence
unsigned int | M_version
Safe_iterator_base * | M_prior
Safe_iterator_base * | M_next
## Protected Member Functions
| Safe_iterator_base ()
| Safe_iterator_base (const Safe_sequence_base *seq, bool constant)
| Safe_iterator_base (const Safe_iterator_base &x, bool constant)

## Detailed Description

Basic functionality for a "safe" iterator.

The Safe_iterator_base base class implements the functionality of a safe iterator that is not specific to a particular iterator type. It contains a pointer back to the sequence it references along with iterator version information and pointers to form a doubly-linked list of iterators referenced by the container.

This class must not perform any operations that can throw an exception, or the exception guarantees of derived iterators will be broken.

Definition at line 50 of file safe_base.h.

## Constructor & Destructor Documentation

__gnu_debug::Safe_iterator_base::Safe_iterator_base | ( |  | ) | `[inline, protected]`

| Initializes the iterator and makes it singular. Definition at line 76 of file safe_base.h.

__gnu_debug::Safe_iterator_base::Safe_iterator_base | ( | const Safe_sequence_base * | seq,
|  | bool | constant
| ) | `[inline, protected]`

| Initialize the iterator to reference the sequence pointed to by . `constant` is true when we are initializing a constant iterator, and false if it is a mutable iterator. Note that `seq` may be NULL, in which case the iterator will be singular. Otherwise, the iterator will reference `seq` and be nonsingular. Definition at line 87 of file safe_base.h.

__gnu_debug::Safe_iterator_base::Safe_iterator_base | ( | const Safe_iterator_base & | x,
|  | bool | constant
| ) | `[inline, protected]`

| Initializes the iterator to reference the same sequence that `x` does. `constant` is true if this is a constant iterator, and false if it is mutable. Definition at line 94 of file safe_base.h.

## Member Function Documentation

void __gnu_debug::Safe_iterator_base::M_attach | ( | Safe_sequence_base * | seq,
|  | bool | constant
| ) |

| Attaches this iterator to the given sequence, detaching it from whatever sequence it was attached to originally. If the new sequence is the NULL pointer, the iterator is left unattached. Definition at line 184 of file debug.cc.

bool __gnu_debug::Safe_iterator_base::M_attached_to | ( | const Safe_sequence_base * | seq | ) | const`[inline]`

| Determines if we are attached to the given sequence. Definition at line 120 of file safe_base.h.

bool __gnu_debug::Safe_iterator_base::M_can_compare | ( | const Safe_iterator_base & | x | ) | const

| Can we compare this iterator to the given iterator `x`? Returns true if both iterators are nonsingular and reference the same sequence. Definition at line 242 of file debug.cc.

void __gnu_debug::Safe_iterator_base::M_detach | ( |  | ) |

| Detach the iterator for whatever sequence it is attached to, if any. Definition at line 213 of file debug.cc.

bool __gnu_debug::Safe_iterator_base::M_singular | ( |  | ) | const

| Is this iterator singular? Definition at line 237 of file debug.cc.

## Member Data Documentation

Safe_iterator_base* __gnu_debug::Safe_iterator_base::M_next

| Pointer to the next iterator in the sequence's list of iterators. Only valid when M_sequence != NULL. Definition at line 72 of file safe_base.h.

Safe_iterator_base* __gnu_debug::Safe_iterator_base::M_prior

| Pointer to the previous iterator in the sequence's list of iterators. Only valid when M_sequence != NULL. Definition at line 68 of file safe_base.h.

Safe_sequence_base* __gnu_debug::Safe_iterator_base::M_sequence

| The sequence this iterator references; may be NULL to indicate a singular iterator. Definition at line 55 of file safe_base.h.

unsigned int __gnu_debug::Safe_iterator_base::M_version

| The version number of this iterator. The sentinel value 0 is used to indicate an invalidated iterator (i.e., one that is singular because of an operation on the container). This version number must equal the version number in the sequence referenced by M_sequence for the iterator to be non-singular. Definition at line 64 of file safe_base.h.

The documentation for this class was generated from the following files:

- safe_base.h
- debug.cc